source: rtems-libbsd/rtemsbsd/include/machine/rtems-bsd-page.h @ 3c302b6

4.1155-freebsd-126-freebsd-12freebsd-9.3
Last change on this file since 3c302b6 was 3c302b6, checked in by Sebastian Huber <sebastian.huber@…>, on 01/27/15 at 07:26:53

Add a simple page allocator

  • Property mode set to 100644
File size: 2.7 KB
Line 
1/**
2 * @file
3 *
4 * @ingroup rtems_bsd_machine
5 *
6 * @brief TODO.
7 */
8
9/*
10 * Copyright (c) 2015 embedded brains GmbH.  All rights reserved.
11 *
12 *  embedded brains GmbH
13 *  Dornierstr. 4
14 *  82178 Puchheim
15 *  Germany
16 *  <rtems@embedded-brains.de>
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 *    notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 *    notice, this list of conditions and the following disclaimer in the
25 *    documentation and/or other materials provided with the distribution.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#ifndef _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_
41#define _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_
42
43/*
44 * A page is a fixed size memory area of size PAGE_SIZE with the ability to
45 * associate an object with it.  The memory pool for pages has a fixed size and
46 * is allocated during system initialization.  This API is intended to be used
47 * by ZONE(9).
48 */
49
50#include <sys/cdefs.h>
51#include <sys/param.h>
52#include <stdint.h>
53
54__BEGIN_DECLS
55
56extern void **rtems_bsd_page_object_table;
57
58extern uintptr_t rtems_bsd_page_area_begin;
59
60void *rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait);
61
62void rtems_bsd_page_free(void *addr);
63
64static inline void **
65rtems_bsd_page_get_object_entry(void *addr)
66{
67        uintptr_t a = (uintptr_t)addr;
68        uintptr_t b = rtems_bsd_page_area_begin;
69        uintptr_t s = PAGE_SHIFT;
70
71        return (&rtems_bsd_page_object_table[(a - b) >> s]);
72}
73
74static inline void *
75rtems_bsd_page_get_object(void *addr)
76{
77        void **obj_entry = rtems_bsd_page_get_object_entry(addr);
78
79        return (*obj_entry);
80}
81
82static inline void
83rtems_bsd_page_set_object(void *addr, void *obj)
84{
85        void **obj_entry = rtems_bsd_page_get_object_entry(addr);
86
87        *obj_entry = obj;
88}
89
90__END_DECLS
91
92#endif /* _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ */
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